fuck，I can't do something
what can i do?
2 years late..! But, you've gotta make sure you hit Alt key to put away the triangle-shaped UI-mode cursor and select one of the 4 given interactive options with keys 1-4.
When she walks in, the first thing you have to do is switch to the hand and give her a playful spank. This confused me at first, too, since all her interaction zones are highlighted red until that very first spank occurs.